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Open AccessArticle

Stomatal Conductance Responses of Acacia caven to Seasonal Patterns of Water Availability at Different Soil Depths in a Mediterranean Savanna

1
School of Engineering, Hydraulic and Environmental Department, Pontifical Catholic University of Chile, Santiago 7820436 Chile
2
Faculty of Forest Sciences and Nature Conservation, University of Chile, Santiago, Casilla 9206, Chile
*
Author to whom correspondence should be addressed.
Water 2018, 10(11), 1534; https://doi.org/10.3390/w10111534
Received: 2 August 2018 / Revised: 21 October 2018 / Accepted: 23 October 2018 / Published: 27 October 2018
(This article belongs to the Special Issue Ecohydrology of Woodlands and Savannas)
Soil water availability controls plant productivity in seasonally dry ecosystems, although plant water use at different soil depths and times is, to the best of our knowledge, not clearly understood. Environmental variables at the canopy level and the soil volumetric water content (VWC) at five different soil depths were continuously recorded for three years (2011–2014) in an Acacia caven savanna site in central Chile. Stomatal conductance ( g s ) was measured every hour during daytime for 42 days distributed across the study period. Values of g s were weakly controlled by photosynthetically active radiation, vapor pressure deficit, and leaf temperature when considering the whole series. The variance proportion being explained increased from 5% to 20% if the whole series was partitioned into a dry and a wet season. According to the above, A. caven exhibited a more anisohydric behavior than previously thought. When we added the VWC in the root zone, to the g s atmospheric variables model, R2 increased to 47% when separately considering the dry and wet seasons. However, we did not find a differentiated use of water in the root zone, but instead a joint activity of the radicular system within the top 100 cm of the soil controlling g s . View Full-Text
Keywords: seasonal dynamics; stomatal conductance; Acacia caven savanna; volumetric water content seasonal dynamics; stomatal conductance; Acacia caven savanna; volumetric water content
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MDPI and ACS Style

Sepulveda M., M.; Bown, H.E.; Fernandez L., B. Stomatal Conductance Responses of Acacia caven to Seasonal Patterns of Water Availability at Different Soil Depths in a Mediterranean Savanna. Water 2018, 10, 1534. https://doi.org/10.3390/w10111534

AMA Style

Sepulveda M. M, Bown HE, Fernandez L. B. Stomatal Conductance Responses of Acacia caven to Seasonal Patterns of Water Availability at Different Soil Depths in a Mediterranean Savanna. Water. 2018; 10(11):1534. https://doi.org/10.3390/w10111534

Chicago/Turabian Style

Sepulveda M., Marcelo; Bown, Horacio E.; Fernandez L., Bonifacio. 2018. "Stomatal Conductance Responses of Acacia caven to Seasonal Patterns of Water Availability at Different Soil Depths in a Mediterranean Savanna" Water 10, no. 11: 1534. https://doi.org/10.3390/w10111534

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